Building Technical Protocol for Artificial Propagation and Commercial Farming of Fish (Onychostoma Gerlachi Peters, 1881) in Kon Plong District - Kon Tum Province
Duong Nhut Long* and Nguyen Hoang Thanh
ABSTRACT
The research title “Building technical protocol for artificial propagation and commercial farming of fish (Onychostoma gerlachi Peters, 1881) in Kon Plong District, Kon Tum Province” was conducted from 2019 – 2021 with the aim of “to build successfully developing technical protocols for artificial propagation and commercial farming of fish to enable their application in practice, conserve, and sustainable development the fish resources in Kon Plong District, Kon Tum Province”.
Research results showed that in practical experiments using hormonal treatments to stimulate artificial propagation, HCG injected alone at a dosage range of 1,500–3,000 IU/kg female fish failed to induce ovulation. However, using a combined treatment of LHRHa + Domperidone (100 µg + 10 mg Domperidone per kg female fish) successfully induced final oocyte maturation and egg release, yielding a fertilization rate of 82.6 ± 3.4%, a hatching rate of 77.1 ± 3.6%, and a fecundity of 50,312 ± 18,392 eggs/kg female fish. In the fingerling nursing experiments, a stocking density of 1,000 fish/m² achieved better growth (1.8 ± 0.24 g/fish) and survival (21.6 ± 2.5%) compared to a stocking density of 1,500 fish/m², which resulted in lower growth (1.1 ± 0.3 g/fish) and survival (11.3 ± 2.7%). In the commercial grow out practical experiments, fish fed a formulated feed containing 30% protein exhibited higher growth (60.3 ± 5.7 g/fish), survival (81.0 ± 2.0%), and yield (4,894 ± 558 kg/ha (P < 0.05) compared with those fed a 25% protein feed, which resulted in a lower average weight (46 ± 6.3 g/fish), survival (73.7 ± 5.9%), and yield (3,367 ± 215 kg/ha).
This research successfully building protocols for fish artificial propagation and commercial farming of Onychostoma gerlachi was significant contributions to the conservation and restoration of this native fish species. The results enable farmers to reliably produce fingerling for aquaculture, providing income and improved livelihood opportunities.
